Mask clip



FIG. 1 is a top-front-right perspective view of a mask clip showing mynew design;

FIG. 2 is a bottom-rear-left perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left elevation view thereof; and,

FIG. 8 is a right elevation view thereof.

CLAIM The ornamental design for a mask clip, as shown and described.